I stumbled upon a few 1960s and 70s documentary film clips from British Pathé featuring some pintables i.e. pinball, EM arcade games and various types of gambling machines.

Apparently, only scientists understand how these machines work!

Slot Machine - AKA Slot Machine Age (1964). What they call slot machines are really just coin-operated machines in general. There's a guy playing pinball in the throes of "slot machine fever", and a bunch of vending machines :https://youtu.be/Y3rGPXXk8VE